A 48-year-old m an com plained to his physician of a feeling of fullness in his neck. Physical exam.

A 48-year-old m an com plained to his physician of a feeling of fullness in his neck. Physical exam ination showed di use enlargem ent of the thyroid gland w ithout any apparent m asses. Further exam s led to the diagnosis of nontoxic goiter, m ost likely endem ic because the m an lived in an iodinede cient country. Iodide supplem entation was prescribed to provide su cient iodide ions to the thyroid. These ions cross thyroid cell m em branes by active transport. Which of the follow ing is the prim ary transporter carrying iodide ions through the apical m em brane of thyroid follicular cells? A. Na+/iodine sym porter B. Sulfate exchanger C. Cl-/iodide exchanger D. Na+/K+ exchanger E. Na+/Cl- sym porter

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